Comments on: Why is my list black? An Android optimization

By: Почему мой ListView черный? Андроид оптимизация. | AndroidTeam. Новости и советы

Fri, 18 Dec 2009 13:10:07 +0000

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By: moskoviaa

moskoviaa — Fri, 08 May 2009 09:09:41 +0000

Добрый день
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Наш сайт forum-grad.ru
На этот форум о Подмосковье заходят более 3000 человек, сайт развиваеться проводяться конкурсы, каждый день разыгриваються призы “100р на телефон” и мы готовы к сотрудничеству.
контакты info(собака)forum-grad.ru
p/s
прошу извинить за вторжени

By: Matthias

Matthias — Mon, 09 Mar 2009 12:28:49 +0000

whoops, it ate all the markup I posted… well, you get the idea.

By: Matthias

Matthias — Mon, 09 Mar 2009 12:27:54 +0000

Hi,

I found styling lists in Android to behave very strange. As soon as I declare a custom List style in my theme, the list divider will disappear in the rendered list, even if I inherit all defaults from @android:attr/listViewStyle!

Setting a custom divider also has never worked for me whatsoever…

I can only make it appear again when removing the line

?style/MyListView

from my theme declaration.

Is this a bug?

By: Romain Guy

Romain Guy — Sat, 24 Jan 2009 20:39:09 +0000

It’s still not worth doing it because 80% of the time, people do not change the background of the ListView.

And the patterned background disappeared because it added too much visual clutter.

By: Mike Hearn

Mike Hearn — Sat, 24 Jan 2009 20:37:28 +0000

Sure OK, but my point is, a solution that gets it right 80% of the time is still worth doing, because it’ll save 80% of developers from having to find this blog post and figure out what’s going on. Even if you don’t get every case and even make the remaining 20% of cases more obscure, it’d still help people in the majority case.

I suppose at some point the hardware will get powerful enough that this optimization isn’t necessary anymore. The patterned backgrounds in earlier SDKs were nice, it’s a shame they disappeared (i guess this is why).

By: Romain Guy

Romain Guy — Sat, 24 Jan 2009 19:53:33 +0000

Your solution doesn’t account for the most common case: a transparent ListView on top of a window with a solid colored background. We thought about a similar solution that would take into account the color and opacity of the ancestors of ListView but we decided that the extra complexity (maintenance, performance, etc.) was not worth it.

By: Mike Hearn

Mike Hearn — Sat, 24 Jan 2009 17:51:58 +0000

Could the ListView do something like:

if (getBackgroundDrawable() instanceof ColorDrawable)
// optimization on
else
// optimization off

I know that nothing stops people creating their own drawables that do the same thing as ColorDrawable, but it seems that this would 99% of the time mean developers don’t have to think about this. Even if the ugly things are a lot uglier than this, it’d still be *really* great to not have this kind of sharp corner in the API. Writing Android apps is already pretty complicated!

By: vovkab

vovkab — Sun, 18 Jan 2009 16:57:28 +0000

Here is Translation of article to russian: http://androidteam.ru/dev/particles/why-my-listview-black.html

Can you add link?

By: Romain Guy

Romain Guy — Tue, 23 Dec 2008 22:29:07 +0000

Unfortunately no. The Eclipse plugin renders the Android widgets with Java2D but they are not interactive. I guess it would be possible to port the Android widget to a desktop, but it would probably require a lot of work and would not end up being that great since the widgets were not designed, at least with the current theme, to be used with a mouse.